Planoqraph co



H.P.LAVENDER.

AIJIOMATICALLY OPENING SCREWING DIE.

APPLICATION FILEDUJUNE 29. |918.

v1 ,309, 1 4 1 Izliented July 841919.

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IIIIIHIH THB COLUMBIA PLANDGRAPH COI. WASHINGTON. D. c.

H. P. LAVENDER.

AUTOMATICALLY OPENING scmwms DIE.

APPLICATION HLED JUNE?? 1918.

E 1 ,309, 1 41 Patent-ed July 8, 1919.

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'me COLUMBIA PLANoGRArIn co.. wAsHlNn'roN, n.

HERBERT lP-RICE LAVENDER, y0F VVVALSALL,` ENG-LAND.

Specicaton of Letters yPatent.. ,Y Patented J111y8,3 1919.

Application led June 29, 1918. Sera1No. 242,522.

To all whom it may concern.'

Be it known that I, HERBERT PRICE LAV- ENDER, subject of I-IisMajesty -the King of Great Britain and Ireland, residing at 65 Bridge street, vI/Val'sa-ll, in the county of Stafford, England,have invented new and useful Improvements in and Connected withy Automatically Opening Screwing Dies, of which the following is a specification.

head or holder 4for holding and operating the same, the said die head'or holder and the dies bein adapted -forluse in a turret lathe or the li e with the die holder carried by the turret or other equivalent part so as not to revolve, or carried b-y the lathe spin-py dle so as to revolve therewith. l

My invention is of that type in which the half dies are adapted to be closed by the operator to their set position for work and to be opened clear of the work by the action of a stop arresting the forward movement of part of the die head when the required length of thread has been formed, means being provided for the micrometric adjustment of the diesand for making two or more screwing cuts of different depths with one setting of the dies. v

The objects of my invention are to simplify'thelconstruction and arrangement of:

the parts of screwing diesand die head of the said type and particularly so that the die holder will have a minimum width so that when carried on the turret or the like of a turret'lathe the die head will readily pass between two tool posts on the cross slide to operate on the revolving work carried by the head-stock. Also I so arrange the dies andthe parts which carry them that there is no fear of the dies being choked or their sliding parts injured by the swarf. Also' the parts of the diehead can readily be taken apart for inspection of the dies orfor other purposes.

I will describe my invention by referring to the accompanying drawings of which Figure l is a side elevation of a self-opening screwing die head and dies constructed and arranged in accordance with'this invention;

Fig. 2 is a front elevation of the same;

Fig. Sis a'sectional side elevation of the same;

Fig. '4:'is a sectional side elevation of the same but showing the die carrier moved forwheel part ofthe same g This invention has reference to automat i`v cally opening screwing dies and tothe die ward and 'the dies opened to release the Work; Fig. 5 isa part sectional plan of the same; Fig. 6 is a part front-,sectional elevation of the same taken yon line X Xlof Fig.` l;

Fig. 7 is a frontl elevation ofthe same showing thedies open;

Fig. 8 is a front elevation of the worm Fig. 9 is a frontelevation, lside elevation and plan of one of the half dies separately;

Fig. 110 is 'alfront elevation of the bottom half die and the side'plates and accessories by which itiscarriedand j .'Fig. 1 1 is a side elevation ofthe same.

In my invention the die head or holder consists of two main membersy which I will call respectively theA body .Af and the die carrierB. The body A isafblockmade with a backwardly projecting 'tubular shank l (detachable from or in a piece with the body A) `adapted to be fixed in the turret or other tool holder of a lathe. The die carrier B has a backwardly projecting ltubular or other shank 2 adapted to fit and slide in the hole or bearing 3 in the front of the body. This hole 3 is continued through the body A from front to back concentric with the axial center line ofthe head, and inthe back parti of the hole the shankl is inserted and Xed. Suitable means are provided to prevent the die carrier 'B from turning lin the body A such for instance vas the parallel sided peg t which is fixed in a hole 5 in the die car rier Bl and yprojects from the back of the same and'` engages in a corresponding hole 6 in the body A. The'die carrier B has a dovetailed or other equivalent parallel sided dieway 7 (F ig. 5) along its front face so as to accommodate thepair of half dies marked respectively 8land'l9 v(oneLof which is shown separately in Fig. 9) each formed with a dovetailed or` other suitably shaped part l0 projecting from the back face and adapted to slide up and down the die-way 7 i The screw threaded portion 11 of the dies are situated and project at the front of the line of the dies and mounted in a bearing 15 in an upper extension part of the die carrier, this cam 13 acting between the top of the upper half die 8 and a block or bridge piece 16 which by the screws 17 is fixed to two side plates 18, 19, situated Vat the sides of the die carrier B. To the lower ends of each of these side plates the other half die 9 is connected by the cross pin 20 which passes through holes in the side plates 18, 19, and through a corresponding hole 21 in the half die 9. The two coiled wire springs 22 arranged at the sides of the side plates 18, 19, connect the upper half die 8 to the upper portions of the side plates 18, 19, and keep the bridge piece 16 in contact with the cam so that the latter will thus cause the half dies 8, 9, to move in opposite'` directions either to their open or to their closed positions when the shaft 14 and the cam 13 are turned in the one or the other direction. The side plates 18, 19, are preferably arranged to iit close along the two sides of the die carrier B which latter is the same width as the half dies 8, 9, and is as narrow as the dies will permit for their range of work. Fixed on the back end of the cam spindle 14 there is an upstanding lever 23 which carries a lateral projection 24 (see Figs. 4 and 5) adapted to engage against the edge 25A (Fig. 8) of an adjustable catch piece 26 which is fixed on the face of a. worm wheel or worm wheel sector 27 which is mounted to revolve loosely on a spindle 28 which latter is mounted in a bearing 29 formed in the body A. The pin 28 has a pin 28X fitting in a recess in the worm wheel 27. This worm wheel sector 27 engages with a worm 30 on a transverse worm shaft 31 mounted inl bearings formed on the body A and furnished with ahead 32 which is micrometrically divided at 33 so that by turning the hea-d 32 the worm shaft and worm 30 and worm wheel sector 27 can be turned in the one or the other direction to adjust the position of the catch piece 26 and the degree of the closing of the dies. The micrometric divisions 33 register with a mark on the body A.

The back end 35 of the worm wheel spindle 28 is screw threaded and furnished with a locking nut 34 by which the worm wheel sector 27 can be locked against the face of the bearing 29 when the desired adjustment of the catch piece 26 has been attained. The two coiled wire springs 36, 37, arranged at the sides of the die head A and having their ends connected respectively on to the ends of the cross pin 20 and to split studs or the like 38 fixed to and projecting from the sides of the body have the effect of drawing the die carrier B and the bod A together and permit of the die carrier moving forward slightly` independently of the body A in the operation of the dies as hereinafter describe j. f

These springs 36 are however not material and they may be placed in other positions or be dispensed with if desired.

The combined dies and die head above in part described act as follows The closing of the half dies 8, 9, to the correct amount to form the screw is first adjusted by turning the micrometrically divided head 32 of the worm s indie which turns the worm wheel sector 2 and adjusts the edge 25 of the catch piece 26 thereof and the lever 23 and cam spindle 14 and cam 13 and also the corresponding amount to which the half dies 8, 9,'are closed when the die head is set as in Figsl, 2, 3, and 5 with the lateral projection 24 of the lever engaging against the edge 25 of the catch piece 26. When the revolving work has been screwed into the dies to the desired amount and the travel of the turret or other tool holder has been arrested by a stop (as is usual) the forward movement of the body part A ceases, but owing to the screw threads of the dies engaging with the work, the forwardinovement of the die carrier B continues for a short distance until the lateral projection 24 of the lever 23 has ridden off the catch piece 26 of thejworm wheel sector 27 (see Figs. 4 and 7) and then the springs 22 cause the top half die 8 and the cross bar 16 to act upon and turn back the cam 13, and the spindle 14 and the half dies 8, 9, iiy open as in Fig. 7 and release the work. v After the body A with the dies have been traveled back clear of the work the lever 23 has to be pulled forward from the position shown in Fig. 7 tothat shown in Fig. 6 so that the projection 24 'will then have passed the edge`25 of thecatch piece and the springs 36, 37, will draw the die carrier. B back into the body A (asin Figs. 1, 2, 3, 5, and 6), so that the lateral projection 24 -of the lever will again engage with the edge 25 of the catch piece 26 and the dies 8, 9, are now again closed ready for the next operation.

In order that at one setting of the dies they can be arranged to take two or more cuts on the same piece of work, so as for instance to first take a roughing cut with the dies at a certain distance apart, and then for the dies to be closed slightly nearer together to take a finishing cut, the lateraly projection 24 of the cam leverk 23 is preferably made adjustable thereon so that it can at will be caused to give slightly different angular positions t0 the cam lever 23 and cam 13 and a corresponding increased clo-l sure of the dies 8, 9. To this end said lateral projection 24 is not formed upon theV side of the lever 23 itself but is formed on a slide 39 which is tangential to the worm wheel sector 27 and is carried on a part 40V of the cam lever 23 and is slidably adjustable thereon by means of` an eccentric` 41y which engages ina cross groove 42 on the slide 39, this eccentric being formed'with an outstandinglever arm 43 andbeing mounted on a transverse pin 44, (see Figs. 4, 5, and 6)- which passes through the cross plate 47 into the hole 48 in the bracket part of the lever 23. Said plate 47 fits .on the face of the cam 41 and is secured in placeby the screw 49 and by the handle part of the lever 23 passing through the plate "and through al slot 50 in the slide 39.

Thus after a cut on the work has been taken with the dies 8, 9, with the lateral projection 24 in a certain position and engaging with the edge 25 of the catch piece 26 of the worm wheel sector, then if desired one two or more deeper cuts can be taken at the same setting of the micrometer 33, as before the next cut is taken, the slide 39 and its lateral projection 24 are moved in slightly by turning the eccentric 41 and thus slightly altering the angular position of the lever 23, and slightly increasing the closure of the dies 8, 9, and imparting a deeper cut to the thread which has been formed on the work.

The springs which hold the die carrier B to the body A are preferably two coiled wire springs 36, 37, as above described arranged at the sides of the body of the die carrier the ends of these springs being connected respectively to the body A and to the die carrier B.

The preferred construction is for the back ends of the springs 36, 37, to be each connected to a cross wire loop or the like fitting in a transverse hole in the body A the ends of these loops projecting at the sides of the body. The front ends of these springs 36, 37 are 'snapped on to the grooved ends of the cross pin 20. Thus when the front ends of these springs 36, 37, have been disconnected from the ends of the pin 2O the die carrier B complete with the various parts connected as aforesaid thereto, is free to be removed from the body A and can as readily be replaced and the ends of the springs 36, 37 snapped on to the projecting ends of the hinge pin 20. The connection of the ends of the two springs 22 from the top of the side plates 18, 19, to the sides of the half top die 8 is preferably made by the end coil of each spring being connected on to pins 53 near the top of the side plates and the other ends of the springs being connected to two wire loop like pegs 54 which are inserted in a hole 55 passing through from side to side of the top die 8 and there retained by the tension of the springs 22. Thus without removing the carrier B from the body A the dies 8, 9, can very readily be removed for examination or for changing or grinding by simply pulling these loop like pegs 54 out of the hole 55 and also disconnecting the lower springs 36, 37 from the cross pin 20 ofthe bottom die and then turning the two side plates 18, 19,- and thetop cross block 16 forward clear of the cam 13 sc that the bottom die will then .slip ydown out of. the die way. so .as-to be removed withthe side plates 18,19, and cross block 16 and springs 22 and .pegs 54 as shownin Figs; 10 and 11. The top'dle 8 can thenrbe similarly removed by being slipped down out of t-he die way 7. Thus the dies 8,9, can readily be removed and changed or replaced and adjusted without employing any spanner or separate tool for the purpose. The top half die 8 is preferably made as a counter-part of the bottom half die so that either can be used in either position.

The accompanying drawings illustrate what I consider to be the best way of carrying my said invention into practice but it is to be understood that my invention is not limited to the precise details shown except as required by the claims as these can be varied to some extent without departing from the nature of my said invention.

What I claim as my invention and desire to secure by Letters Patent is 1. In a combined die head and automatically opening screwing dies of the type described, the combination of a body member, a die carrier slidably mounted on the body member and having a cross guide on its front face, a pair of half screw dies mount-y ed in said cross guide, a cross block, a cam mounted on the die carrier and adapted to act between one of the half dies and said cross block, two side plates connected to the other half die, a spring for keeping the half die and the cross block in contact with the cam, a die setting lever carried on said cam, a lateral projection on said lever, a worm 105 wheel carried by the body member, a catch plate on said worm wheel `and adapted to be engaged by said projection, and a worm gearing coacting with said worm wheel for adjusting the same, the arrangement being 110 such that the turning of the die-setting lever in one direction turns the cam to a predetermined position so that the dies are closed together and the die setting lever is retained in such position by engaging with said catch 115 plate from which it is adapted to be released by the body stopping at the termination of the threading process and moving the dies and die carrier forward on the body member.

2. A combined die head and automatically opening screwing dies according to claim 1, in 'which the lateral projection of the setting lever is made adjustable thereon so as to close the dies nearer together without 125 altering the setting of the dies, substantially as set forth.

3. Ina combined die head and automatically opening screw die, the combination 0f a die carrier formed with a dovetailed die- 130 Way on its front face, a pair of half screwing dies slidably mounted in said die-Way so as to advance toward or recede from one another, a double acting cam carried on the die carrier, a setting lever on said cam, a cross block, said cani acting between one of the half dies and thel cross "block, two side plates carried by said cross 'block and connected to the other half die, and tWo coiled Wire springs connecting Vthe other half die v10 to the side plates and keepin said half die and cross block in contact Wit the cam.

In testimony `whereof I have signed my name to this specication. A

y HERBERT PRICE LAVENDER.

Copies of this patent may be obtained for five cents each, by `addressing* the Commissioner of Patents,

Washington, D. C. 

